#class_navigation {
    margin-left: -8px;
}

#class_navigation a div {
    display: inline;
    padding: 4px 12px 2px 12px;
    margin: 0 8px;
    font-size: 18px;
    color: #444;
    text-shadow: #888 1px 1px 1px;
    background: rgba(128, 128, 128, 0.25);
    text-align: center;
    border-top-left-radius: 16px;
    border-top-right-radius: 16px;
}

#class_navigation a div.active {
    background: rgb(255, 255, 255);
    border-top: #ccc 1px solid;
    border-left: #ccc 1px solid;
    border-right: #ccc 1px solid;
}

#students {
    border-top-left-radius: 0;
}